Derpy doesn't know it, but Dinky Doo and Amethyst deliberately hide her lunch from her so they can go with her on her rounds, using the artificial wings Dinky's classmate made for them upon request. They're too poor to buy that kind of hardware on their own and these ones tend to break a little easily, but at least they can keep an eye out for their mother.... Ever since the accident, they've been a little over-protective of her... Luckily, Derpy knew a -very- good Doctor who fixed her head and wing up. Her daughters were very grateful. They've only got one mother, after all, they'd like to keep her.Incidentally, her daughters are also the source of that warm, comfortable, slightly itchy and a little too big sweater. She's already warned their aunt Daring she should probably brace herself for one of her own this Christmas...

Yes, everything in this picture is according to my own head canon and fanon. It's convoluted and over-thought, thank you for asking XD

Hmm... Well, if my guess it right, that would probably be technically true. You said her head was injured as well. Does it have any augments that we can't see, whether because of the angle, or her cap?

Yeah, it does, and I should probably draw you guys a picture of it, even if it's just a sketch or something, just to satisfy your curiosity and my own knack for drawing mutilated ponies XD;;Ahem, I'm not entirely sure exactly -what- it looks like, but a metal plate in her head is a given, plus some nasty scarring and maybe something with her eye as well.

Well! That all depends on how sturdy you want them, what purposes you'll be needing them for and how often you're willing to face the fact that they might explode. All of which can be conveniently filled in on this form, generously provided by Rarity Industries. Have a nice day!~

And that stuff's actually a heating-device for her back legs, standard gear for weather ponies and mailmares >w< The liquid is self-heating and constantly pumped through the hollow parts of the copper, in turn warming Derpy's legs up and making sure they don't fall off due to some of the more malevolent "any kinds of weather" she has to brave on her routes. Another fine product of Canterlot Gears, order yours today!

And that's actually because of the parody called "Friendship is Witchcraft," which you can find on youtube; I recommend it, it's hilarious >w<Anyway, in that parody, Sweetie Belle is a robot, so it's become a common gag >w<

Both true! Although Dinky's wings were made by Applebloom, as is implied in the description, so that's artificial flight >w< I like to imagine Derpy lost her wing (and possibly her eye) in a storm. At least that's what -she- keeps telling everypony >w<